also want to mention, not everyone even INHALES when they vape. You can actually get enough nicotine delivery by just taking into mouth and blowing out nose. This is certainly another test you can try, once you have completed the above. 
(((debb))) I had no clue that you were having issues tooI read somewhere here on the forum that VG is not the thing that you should be vaping if you have respiratory/lung issues.
I was using a 50/50 blend but recently went to a 70/30. I think that I see a slight improvement but really too soon to tell.
I was having some breathing problems for a few months - and wondered if it was something in the flavorings - so I switched to vaping unflavored - and found, surprisingly - that I got just as much enjoyment vaping unflavored as flavored.
Also I upped the strength of my e-liquid to 30 mg/ml - thus I was able to satisfy my nic craving while vaping less. I don’t know which of those changes made a difference, but I have had no breathing problems for over a year.
Thanks for all the information. I need to take it all in and figure out what to do. I know the best thing would be to just quit smoking all together. But we all know how hard that is, and I have plenty of stress in my life right now. I think that definitely lowering from 18 mg is the first thing I need to try, and also try a different brand as I always did use the same one. I never did the flavored ones, always just tobacco or Marlboro. Does 0 mg satisfy the craving for a cigarette? I never tried that. I need to study all these
Thanks for the quick reply, best place to get them?
Thanks for the quick reply, best place to get them?